From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 780D6487A7 for ; Fri, 1 Nov 2024 13:05:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730466309; cv=none; b=Ft4lpDFXHp1HhjxRoaq85VV3U9lqAYRoxW0WB7B+Poz4yB/OyDJDRoiHRFiG1mPsb3PFejlSXP7au1JInuO30sQ+2TTDV97LW2wkipQNZsVtXDgNkQ82KazfxuTglCW+th/rfOoPpq3hXM63jOObb6tZOEd0wHEhIaicGACMNbg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730466309; c=relaxed/simple; bh=NeqFM8+pRx4BanU+xWxtmgkMRgkqPdTK0aOdkPr8vH4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Z3nqtSu4ai0Bt+hitEBlxutULddQ1TXgY/mnJsMc0z5YxTVZxVxAnHErpLI6lW+AC5vX64eYe36K1MWaeJBx4i/1D3DbcojDSU/9VrHbqR31+EIDVWCLoex3PatMUALNwqCfgRV/Nrt9ZnXq+k8W+nCg+S1bwDHyO78x/HFtfIQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=g5XCGakZ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="g5XCGakZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A6E3C4CECD; Fri, 1 Nov 2024 13:05:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730466309; bh=NeqFM8+pRx4BanU+xWxtmgkMRgkqPdTK0aOdkPr8vH4=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=g5XCGakZFJ86Gtr1591fsf2i4voDtIK98wJDd9rLkNcyUlfLy7AmsWqnLzXWadOBt Do3po3JNzdDEPUJQf8qqNFUHcPagHdAdpkLwtpvYHRXt4lpjmsZuEN09QvCY31BPQS n4kmF4Q+CIWOUNHrxDBPXrlvPKpXZnc59/QlkxZvLIhE0l7/HpQ8uo1kbi7G2m3RLU lE3ARZKu2lZ8OzkF1dIh2vYJ7X8UvWrzTGVeQDScBxjrJ+liTr+3EL58h79MUatU/r WFN5p+k6rkwaKqS/xQJSqVPS7tnVksSx4+JN2kQ0KgZ0Awp7EjZ04YavRfHStOc4IR QkwKUfqy8Qw5g== Message-ID: Subject: Re: [PATCH v3 8/8] NFSD: Send CB_OFFLOAD on graceful shutdown From: Jeff Layton To: cel@kernel.org, Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, Chuck Lever Date: Fri, 01 Nov 2024 09:05:07 -0400 In-Reply-To: <20241031134000.53396-18-cel@kernel.org> References: <20241031134000.53396-10-cel@kernel.org> <20241031134000.53396-18-cel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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If an async COPY operation happens to be running when the server is > shut down, notify the requesting client that the copy has completed. >=20 > Since the nfs4_client is going away, seems like this could introduce > some UAFs. >=20 > Signed-off-by: Chuck Lever > --- > fs/nfsd/nfs4proc.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c > index 4c964bce6bd7..51b3f85f3791 100644 > --- a/fs/nfsd/nfs4proc.c > +++ b/fs/nfsd/nfs4proc.c > @@ -68,6 +68,8 @@ MODULE_PARM_DESC(nfsd4_ssc_umount_timeout, > =20 > #define NFSDDBG_FACILITY NFSDDBG_PROC > =20 > +static void nfsd4_send_cb_offload(struct nfsd4_copy *copy); > + > static u32 nfsd_attrmask[] =3D { > NFSD_WRITEABLE_ATTRS_WORD0, > NFSD_WRITEABLE_ATTRS_WORD1, > @@ -1381,8 +1383,10 @@ void nfsd4_shutdown_copy(struct nfs4_client *clp) > { > struct nfsd4_copy *copy; > =20 > - while ((copy =3D nfsd4_get_copy(clp)) !=3D NULL) > + while ((copy =3D nfsd4_get_copy(clp)) !=3D NULL) { > nfsd4_stop_copy(copy); > + nfsd4_send_cb_offload(copy); > + } Not sure about a UAF, but it seems like NFS4ERR_DELAY returns might delay the client destruction for quite a while. Maybe this CB_OFFLOAD shouldn't retry on DELAY? > } > #ifdef CONFIG_NFSD_V4_2_INTER_SSC > =20 --=20 Jeff Layton